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#1




Formula for Relative Percent Difference...
I'm trying to develop a data control chart and I can't find the function for
relative percent difference...I think it might be a nested function that I need to use? I'm new to this aspect of excel so, please be kind. I have found the formula ABS (AB)/A but I need a function for relative percent difference....how can I chage the following formula into something that works in excel? (ab)/((a+b)/2)*100 = relative percent difference, where a is a data point in colum A and b is a data point in colum B? Thanks 
#2




Formula for Relative Percent Difference...
JIn an empty cell, just replace the a and b with the actual cell references..and place an = sign in front. e.g =(A2B2)/((A2+B2)/2)*100 where cell A2 contains your a data point and cell B2 contains your b data point.  NBVC Where there is a will there are many ways. 'The Code Cage' (http://www.thecodecage.com)  NBVC's Profile: http://www.thecodecage.com/forumz/member.php?userid=74 View this thread: http://www.thecodecage.com/forumz/sh...d.php?t=125550 
#3




Formula for Relative Percent Difference...
"bnorris" wrote:
(ab)/((a+b)/2)*100 = relative percent difference No. I believe RPD is: abs(ab) / ( (a+b)/2 ) * 100. See http://en.wikipedia.org/wiki/Percent_difference . In Excel, that can be written: =ABS(A1B1) / AVERAGE(A1,B1) formatted as Percentage. Alternatively: =2*ABS(A1B1) / (A1 + B1) again formatted as Percentage.  original message  "bnorris" wrote in message ... I'm trying to develop a data control chart and I can't find the function for relative percent difference...I think it might be a nested function that I need to use? I'm new to this aspect of excel so, please be kind. I have found the formula ABS (AB)/A but I need a function for relative percent difference....how can I chage the following formula into something that works in excel? (ab)/((a+b)/2)*100 = relative percent difference, where a is a data point in colum A and b is a data point in colum B? Thanks 
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